They used EMSI's extensive labor-market database, which pulls from over 90 national- and state-employment resources, to look at supply and demand (the number of job ads companies post each month outpace the number of people they actually hire), growth, and salary data for every profession in the database.

They then sorted the results by the required level of education.

Here are the occupations with the largest gap between job openings and hires that don't typically require a college degree. (Some occupations may require additional training after high school.)